find the root directory of a directory in ruby

To find the root directory of a directory in Ruby, we can use the Filesystem module and the dirname method of the File class to get the parent directory path repeatedly until we reach the root directory. Here's an example code block:

main.rb
path = "/path/to/directory"
while path != "/"
  path = File.dirname(path)
end
puts "Root directory is #{path}"
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In this code, we start with a directory path (/path/to/directory in this example) and loop through the parent directories using File.dirnameuntil we reach the root directory (which has the path /). Finally, we print out the root directory path.